128500530 has 16 divisors (see below), whose sum is σ = 308401344. Its totient is φ = 34266800.

The previous prime is 128500529. The next prime is 128500543. The reversal of 128500530 is 35005821.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128500530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2141646 + ... + 2141705.

It is an arithmetic number, because the mean of its divisors is an integer number (19275084).

Almost surely, 2^128500530 is an apocalyptic number.

128500530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128500530 is an abundant number, since it is smaller than the sum of its proper divisors (179900814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128500530 is a wasteful number, since it uses less digits than its factorization.

128500530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283361.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 128500530 is about 11335.8074260284. The cubic root of 128500530 is about 504.6244700238.

The spelling of 128500530 in words is "one hundred twenty-eight million, five hundred thousand, five hundred thirty".